| 摘要 |
PURPOSE:To make it possible to obtain effective rotating speed even during weak wind as well as resist against high speed revolution during strong wind by constituting pitch angles for a blade to the direction of wind so that the pitch angle may be automatically variable. CONSTITUTION:Any number of spokes 8 and 8' are projected in a radiating and symmetrical arrangement from the circumferential faces of flanges 7 and 7' and communicated to a circular-shaped limb 9. An elevated part 12 of a blade 11 is loosely fitted to the lower end of a pin 10. A shaft piece 13 at the lower end of the blade 11 is loosely fitted into a bore of the flange 7. A coil spring fitted to the upper end of each pin 10 is fastened to the blade 11 on one end, and fitted to the end of bolts 15 on the other end of the coil spring 14. During no wind condition, the pitch angle of the blade 11 is zero (90 deg. to the direction of wind) by the elastic force of the coil spring 14. When receiving wind, each blade is subject to the wind pressure and is gradually opened to the leeward side, resisting against the elastic force of the coil spring 14, that is, the force of bias and obtains the pitch angle in proportion to the wind force and then rotates with a selected pitch angle. |
